Respuestas

2011-12-21T10:44:04+01:00

a)4x-3+2x=8x-3

6x - 8x = -3 + 3

-2x = 0 /:(-2)

x = 0

b)3-5y-8y+4+4y=25

-9y = 25 -7

-9y = 18 /:-9

y = -2

c)5x-3+2x=4x+9-x

7x- 3x = 9 + 3

4x = 12 /:4

x = 3

d)4y-18+7y=3+9y-15

11y - 9y = -12 + 18

2y = 6 /:2

y = 3

e) -3(x-2)=-12

-3x + 6 = -12

-3x = -18 /:(-3)

x = 6